Hi melo,
It wouldn’t be the same memory foam as Tempurpedic because Tempurpedic uses it’s own memory foam but it may be the same in terms or quality/density.
In general terms … latex is a more durable material than memory foam even in a one sided mattress and if it is also made two sided and can be flipped then this can also add to the useful life of a mattress as well. Post #3 here and the posts it links to has more about two sided mattresses. There is also more about the factors that can affect durability and the useful life of a mattress in post #4 here.
Flexible Foam has a foam manufacturing plant in Spencerville so this could be the source of his foam. Like most North American foam manufacturers … they are CertiPur certified*.
ADMIN NOTE: *Removed 404 link|Archived Footprint: certipur.us/pages/for-industry/find-a-foam-supplier/flexible-foam/
Any adjustable bed can be used under a mattress that is suitable for use with an adjustable base and they all perform similar functions. I would focus first on first comparing mattresses and treat the purchase of an adjustable bed under it as a separate purchase (post #3 here and the adjustable bed thread it links to may be helpful with this).
Memory foam is a completely different animal than latex and they are not really comparable. Some people prefer one and some prefer the other (and some prefer a combination of both). The choice between them would be based on your personal preferences. There is more about the differences between them in post #2 here.
Softness and firmness is relative to each person but he’s right that latex comes in a very wide range of softness/firmness levels from ultra plush to ultra firm. The choice between different materials though is always based on your own personal preferences but regardless of which type of comfort layers you prefer it’s important to make sure they are good quality durable materials.
Phoenix